Bolt-cutter



(No Model.)

M. D. LUEHRS. BoLT GUTTER.

No. 508,549. Patented Nov. 14, 1893.

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UNrTED STA-'riasA PATENT Ormea.

MICHEL D. LUEHRS, OF CLEVELAND, OHIO.

BOLT-CUTTER.

SPECIFICATION forming part of Letters Patent No. 508,549, dated November 14, 1893.

y Application led March 20, 1893. Serial No. 466.807. (No model.)

To all whom it may concern: Y Be it known that I, MICHELD. LUEHRS, a

cltizen of the United States, residing'at Cleve-- land, in the county of lOuyahogaand State of Ohio, haveinvented certain newand useful Improvements in Bolt-Cutters; and I do herebydeclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. My invention relates vto improvements in the die heads of holt cutters. Its object is to secure better and readier adjustment of the parts regulating the travel of the dies, and it consists in the arrangement and combination of parts to accomplish that end, the invention herein shown being in the nature of an improvement uponthat class of bolt cutters in which the radial movement ofv the dies in the cutter head is effected by the sliding of a die-ring having inclined grooves or ribs with which the dies engage, and which die ring is reciprocated on the barrel by a clutch-ring having the usual handle'land either connected to or operating directly or indirectly upon the die-ring. Devices of the class named are shown in the patent to Morgan and Anderson, No. 214,306, dated April 15, 1879, and the patent to myself, No. 268,508, dated December 5, 1882, and to such my present improvement is especially applicable. v

In the drawings Figure 1 represents a longitudinal section through a bolt cutting diehead embodying my invention. Fig. 2 is a `front end elevation of the same, in which the line :1c-y indicates the plane of section shown in Fig. 1. Fig. 3 represents a transverse section through the head, on the line z-z of Fig. 1, showing also a modification in thefo'rm of parts. Fig. 4 is a plan view of the sliding block M, lever or dog D, and adjusting screw L, the latter partially broken away.

A represents the barrel or body of the head, having at its front end radial slots in which the dies B play.

.ing on a pivot f and actuating the die-ring C Y the stud projects from the die-ring.

inthe manner and by the means presently to be described. f

N is the clutch-ring, operated in the usual mannerby a handle (not shown) which en-4 gages with the groove 'in ring N, the latter sliding on the barrel and riding over the dog orflever D. A stud H secured to the die ring O receives the'thrust of the dog or lever D when the latter is forced down by slidlng the clutch ring N against its forward end, and

`this movement of course pushes forward the die-ring to which stud H is attached, causing into the ring C and into stud I-I by threads of dierent pitch, while in the patent to Morgan andAnderson this stud is not connected to the lever D, which is ,called by them la dog and has its rearward arm extremely short, but is nevertheless a lever of the bell crank type, so that in one case the lever or dog, when forced down by the clutch ring, forces forward the die-ringV byr pushing directly upon the stud through the toggle, while in the other case it rides upon the stud after the manner of a cam, but similarly pushes forward the die-ring.

Obviously the depth of the cutis governed by the extent to which the die-ring is forced forward, and this is regulated in my former patent bythe adjusting screw I, and in Morgan and Andersous patent by turning 1n or out the stud H which was itself threaded into thedie ring, in both cases the adjustment being eiected by varying the extent to which cases it is found desirable to have a greater range of adjustment than is practically or conveniently obtainable bythe movement of the stud H alone, and as theA longitudinal movement ofthe pivotal point of lever or dog D has the same effect as 'a contrary movement of the stud, I effect the increased adj ustment by locating the dog or lever D in a recess d` formed in a sliding block M, which is fitted in a recess or chamber o in the barrel In many IOO A, the recess o being longer than block M and its sides forming guiding ways therefor so as to limit the movement of block M to a longitudinal one. L is a screw extending longitudinally through the recess o partially within and partly without the lateral line thereof, and having at each end of the recess a bearing in the barrel A. This screw is threaded in that portion of its length which lies within the recess o, and extends through to the frdnt of the cutter head where its head 1s exposed for the purpose of adjustment. That part of the screw lying in recess o engages a thread on the block M, so that by the turningy of this screw the block is caused to traverse longitudinally in the recess o, and at the same time it serves to prevent the block from lifting out of the recess in case both are rectangular in section, as shown in Fig. 2. I prefer however, on the score of economy, to make the block M cylindrical in cross section as shown in Fig. 3, in which case the recess d may be milled out at the same cut which makes the slot in the barrel through which the lever D plays, and the recess o is formed by drilling in from the back end of the barrel, which is cheaper and quicker than cutting the rectangular recess shown in Fig. 2, and fitting a rectangular block theretol such as is shown in Figs. 1, 2 and 4.

K is a face plate secured to the front of the barrel and serving to retain the dies within slots.

It is possible to so far depart from the construction shown in either of the above nientioned patents as to employ a dog having no rearward extension and which is not connected to the diering,butwhich has a curved or inclined front face bearing upon the stud H, and which operates to force forward the die ring by means of such inclined face when the dog is forced down by sliding forward the clutch-ring; my improvement is equally applicable to such construction, and indeed to all cases in which the die-ring is operated by means of a pivoted dog or lever, since it consists, broadly stated, in making the adjustment for depth of cut by the movement of the pivotal point of such dog or lever instead of by the movement of the stud on the die-ring upon which said dog or lever acts, as has always heretofore been done, or by both conjointly.

On moving back the clutch-ring itdraws back the die-ring, either by a direct connection therewith, or by striking the back end of lever D causing the latter to draw back the die-ring, thus withdrawing the dies from the thread and leaving the bolt clear for removal. By thus pivoting the dog or leverin a traversing block I obtain a greatly increased range of adjustability without changing the size or form of any of the parts previously in use, and I am able if desired to dispense entirely with the use of screw I for adjustment and obtain the entire adjustment by means of the screw L and sliding block M, but I consider it preferable however to retain the screw I, since by giving to the screw L a pitch intermediate between that of the two threads of screw I, or differing from either of them, I am able to accomplish a finer adjusment than could be readily effected by either one alone; and besides this any wear or lost motion of one screw would be compensated by the other, and thereby greater efficiency and durability secured.

Although I have shown the screw L in lateral engagement with the sliding block M, I do not limit myself to that arrangement, as the screw might be tapped into the block centrally by simply increasing the size or length of the block, and in such case would need but a single bearing in the barrel forward of the recess o.

lVhat I claim as my invention, and desire to secure by Letters Patent, is-

1. In abolt cutter the combination with the cutter head of a sliding block, a rocking lever pivoted to said block and connected to the die-ring, and an adjusting screw engaging the sliding block and having abearing in the cutter head, substantially as described.

2. In a bolt cutter head wherein the dies are moved radially by a sliding die ring actuated by a rocking lever, the combination,with the barrel of the die head, of a block seated in a recess in the barrel and havinglongitudinal movement therein, to which block the rocking lever is pivoted, and an adjusting screw engaging a thread on said block and having at 'each end a bearing in the barrel, substantially as described.

3. In a bolt cutter head wherein the dies are moved radially by a sliding die-ring, the combination of the die-head barrel having a recess therein, a block tting said recess and movable longitudinally therein,a rocking lever pivoted in said block and connected to the die-ring by a toggle, a clutch ring sliding on the barrel to operate said lever, and a screw extending through said recess in engagement with a thread on said block and having a bearing in the barrel at each end of the recess, substantially as described.

4. The combination with a bolt cutter head having a pivoted dog moved by a clutch ring to force forward the die-ring, of a sliding bearing for the pivot of the dog, consisting of a sliding block in which the dog is pivoted and a screw engaging said block and having a bearing in the cutter head, substantially as described.

In testimony whereof I hereto affix my signaturen presence of two witnesses.

MICHEL D. LUEI-IRS.

Witnesses:

DANIEL M. LUEHRS, LoREN PREN'riss. 

